Treadle — MIDI Expression
Expression & vibrato control
Only for iPhone
$4.99
iPhone
Turn your iPhone into a two-axis MIDI expression controller. Slide up for expression, glide sideways for vibrato — built for SWAM and any MIDI instrument.
Treadle turns your iPhone into a fluid, two-axis MIDI expression controller for any instrument that listens to MIDI CC.
Drag your finger up and down to send continuous expression (default CC 11). Glide left and right to add vibrato on a second CC (default CC 1 / Mod Wheel) — exactly what SWAM and Audio Modeling instruments expect for breath, bow pressure, and vibrato depth. One thumb, two expressive dimensions, in real time.
BUILT FOR EXPRESSIVE PLAYING
• Vertical axis → any CC you choose (expression, volume, breath, filter…)
• Horizontal axis → a second independent CC for vibrato or modulation
• Per-axis min/max range and response curve, so the full screen maps to exactly the range you want
• Invert, channel select (1–16), and any CC number 0–127
CONNECTS TO EVERYTHING
• Bluetooth MIDI — connect to a BLE pedal/synth, or advertise your iPhone so a Mac/iPad can connect to it
• Appears as a virtual MIDI source ("Treadle") to other apps on the device
• Send to all destinations or pick one
• Works over USB and network MIDI too
DESIGNED TO STAY OUT OF THE WAY
• Full-screen control surface, status bar hidden
• Optional on-screen position indicator
• Two-finger tap (or the gear) for settings
• Optional debug overlay showing live values, CC, channel, and destinations
Perfect for SWAM woodwinds, brass and strings, expressive synth patches, and any rig where you need smooth, hands-on continuous control without reaching for a hardware pedal.
SWAM is a trademark of Audio Modeling S.r.l. Treadle is an independent app and is not affiliated with, endorsed by, or sponsored by Audio Modeling.
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The developer, Abraham Jeyaraj, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Abraham Jeyaraj
- Size
- 705.5 KB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Praise Studios
